Nationally renowned gunshot wound expert Dr. Vincent Di Maio testified that Zimmerman's gun was touching Trayvon Martin's clothing but was 2 to 4 inches from his body. This supports Zimmerman's claim that Martin was on top of him when he fired the shot. Under cross-examination, Di Maio said it's possible Martin could've been pulling away when he was shot.

3.Martin could've been conscious for 15 seconds, alive for 3 minutes

Di Maio said Martin could've been conscious for 10 to 15 seconds after he was shot, but he could've been alive for 1 to 3 minutes. This gives support to Zimmerman's claim that Martin said, "You got me," after he was shot.

4. Zimmerman's head injuries consistent with concrete, expert says

Di Maio said the injuries to the back of Zimmerman's head are consistent with being slammed against concrete. He identified at least six injuries Zimmerman suffered during the struggle. A state witness said Zimmerman suffered as few as three injuries.

5. Expert witness paid $400 per hour ($2,400 total)

State prosecutor Bernie de la Rionda pointed out on cross-examination that Di Maio was being paid by Zimmerman's defense. Di Maio said he was paid $400 an hour and had been paid $2,400 so far. He added, "It's not a complicated case forensically."

6. Sanford's city manager takes the stand

Sanford city manager Norton Bonaparte took the stand for a short time Tuesday. Bonaparte testified about playing the 911 call for Martin's family, which captured screams before the fatal shot. He said the calls were played for the family without law enforcement present as a courtesy, before they were set to be released to the media and public.

7. Was Zimmerman witness in the courtroom during testimony?

Attorneys will be in the courtroom at 8 a.m. Wednesday to discuss reports that defense witness John Donnelly was inside the courtroom during testimony, which is a violation of witness sequestration. The picture above appears to show him above Zimmerman's left shoulder on June 25.

8. Will crime scene animation be allowed?

Judge Debra Nelson will decide whether a crime scene reconstruction animation will be allowed in trial. Court went into overtime Tuesday as attorneys questioned the man who put together the animation.

9. Judge walks out

Judge Debra Nelson walked out of the courtroom Tuesday night as Mark O'Mara questioned her 8 a.m. Wednesday start time and Don West said he couldn't keep up with the pace of the trial much longer.